I'm at the point where I feel useless I need someone to take care of me. I made 2 trips to the kitchen today. One to make an English muffin and another to heat up my rice pack. Now I'm in horrible pain. I hate that I can't take care of myself. My mom has to do almost everything for me. I can't even get the shower set up for myself. I can't make my own food because I can't stand that long. I can't even sit in my living room for more than 20 minutes because I need to come back to my room to elevate my leg so I'm comfortable. I hate I can't do anything. How do I get past this feeling of uselessness.
It's only 11 days since you had very major surgery. Annoying as it is, all you are feeling is normal for your stage of recovery.
KarriB has posted what level of activity you should be doing and I'm going to post the link to that same article:
Activity progression for TKRs
You'll see from that article that you shouldn't even be trying to make your own food yet. Stay out of the kitchen!
See, you're trying to do too much at this stage. I think that's why you're having so much pain, too. Your knee is telling you to stop trying to do so much.
You are taking your medications on a regular schedule too, aren't you?
Where are you using that hot rice pack? Because you shouldn't be using heat on your knee. Heat will make it swell more. At this stage, ice is what you need.
Here is an article that might help you to feel less bad about having to be helped:
Nurturing mother: how to let go and accept help
Your job right now is to rest, rest, rest, and to elevate and ice your knee. That's all! Time doing those things will be time well spent, because it will keep your knee happy, so that it can heal better. Try to look on resting as an investment in your future mobility.